Sheet metal piston manufacture



Dec. 14, 1937. G. M. AMBRoslus 2,101,888

` SHEET METAL PISTON MANUFACTURE v Filed May 25, 1936 2 Sheets-Sheet lHHH ATTORNEY.;

Dec. 14, 1937. G. M. AMBRoslus SHEET METAL PISTON MANUFACTUHE 2Sheets-Sheet 2 Filed May 275, 193e Zay 5 BY u n l ATTO E .9,

- latentecl Dec. 414, 19`37 UNITI-:D '.sTATEs SHEET METAL .rls'roNMANUrAcTUan George M. Ambrosius, Lakewood, Ohio, assignor to TheStandard -0il Company (0hio),-Clcve land, Ohio, .a corporation of OhioApplication May ss, 1936, serial No. $1,635 'i claims.- (climi-'19 Thisinvention, relating to sheet metal ware manufacture, has more particularreference to the production of metallic structures` on the order ofpistons such as for grease cartridges. etc; and

it is among the objects of the invention to facilitate accuratemanufacture of such articles. Other objects and advantages will appearas th'e description proceeds.

To the accomplishment of the foregoing and `related ends, the invention,then, comprises the features hereinafter fullyldescribed, andparticularly pointed out in the claims, the following description andthe annexed drawings ysetting forth in detail certain illustrativeembodiments of the invention, these being indicative however, of

but a few of the various ways in which the principle ofthe invention maybe employed. In said annexed drawings:-

- Fig. 1y is a vertical sectional view of die mech-- .20 anismcontemplated in the invention; Fig. 2 is a plan v iew thereof Fig. 3 isa section corresponding to Fig.'1, showing the parts in closed position;and Fig. 4 is a transverse section taken on a plane substantiallyindicated by line IV--IV,

25 Fig. 1.

In an assemblage of die elements, as indicated in Fig. 1, etc., dieblocks 2, 8,7`are arranged for reciprocatively opposed motion so as toclose together and be separated by some suitable 30 means, as forinstance a reciprocating press. me-

chanical or hydraulic, the respective die' blocks being securedtothe-jaws P thereof. Fixed tobne of said die blocks, 8, is a central studs, having a cylindrical body portion 5 and a taper cam 4po'r- 5 tion 8.The stud may be secured to the die block by suitable means, for instancescrews 'I.V About the stud and reciprocable thereon is a follower plate8 capable oia limited excursion of movement, being urged in a directionaway from the 40 block by spring means 8. To limit the movement of suchfollower plate, a shoulder retaining means or ring s nightly overnangingthe plate, 1s suitably secured to the die block 8, such as by screws I8.On the follower plate is an inner set of 5 radially movable die sectionsI2 having raised central portions I8 with die surfaces peripheral f lythereon. The movable die sections I2 are actu-` sections i8,- thesebeing reciprocativeiy mounted...

v conveniently on the die sections I2, and having 'lvrlnt means i8therebetween, asin recegses ,for

normally separating the inner' and outer die sections. A suitableretaining means or guide, as retaining ring I1 prevents disassembly,while permitting radial reciprocating movement of the die sections I8.On the outer ends of the die sec- 5 tions I5 are cam or beveled surfacesI8, andthe other die block 2 carries an actuating cam therefore,such ascam. ring 28, internally beveled as, at 2| to coact with the Jcam*surfaces I8 when forced thereagainst. The actuating cam is 10 suitablysecured to the die block 2, as by screws 22. From the structure this farit is seen that n when'the die blocks 2 and 8 are` forced intoapposition by the press the cam 20 riding ontp the cam ends I8 of theouter set of die sections 15 beyond the springs 26. Y Centrallyof thefollower l ring 2l is a center follower 21,4havinga blank-engagingcenter stud 2l. This follower is also normally urged away-from the dieblock by suitable means, as spring means 88. To properly limit the rangeof motion of the center follower, a shouldered Aretaining means or ring8| is arranged in relation, and held to the die block by suitable means,as screws'82. l With the pressi ready for operation, and the dies inposition as in Fig. 1, a sheet metal blank is fed linto the die cavityby suitable means, hand feed or automatic, the detail being immaterialhere, and with the closing of the dies, the coacting die surfaces shapeand true the sheet metal blank to nal nished form F shown in Fig. 3.With 40 the separation or opening of the dies, vthe sheet .'metal, pieceor formed piston is free, and is dis- A' .charged suitably, manually orby an air blast -through an air duct ain the die block 3. .A new blankis fed, and the operation repeated.

- Other modes lof applying the principle of the invention may beemployed, change being made 4as regards the details described, providedthe features stated in any of the followingv claims, or

the equivalent of such, be'employed. 60

'M to'one of 'said blocks havinga cylindrical 56' body and taper cam, afollower plate reciprocable on such stud, spring means tending to thrustsaid follower plate away from said block, a shouldered retaining ringfor limiting movement of said follower plate, an inner set of radiallymovable die sections on said follower plate to be spread by said tapercam and having raised central portions with peripheral die surfaces, anouter set of radially movabledie sections on said inner die sections,beveled cam surfaces on the outer ends of said outer die sections,spring means tending to separate the outer and inner die sections, aretaining ring for holding said outer die sections against disassembly,an internally beveled cam ring carried by the other of thefirst-mentioned opposed die blocks adapted to coact with the beveled camsurfaces on the outer ends of said outer die sections, a follower ringcarried by the same die block internally of said cam ring, spring meansnormally urging said follower` ring from the die block, a.` centerfollower carried by the same die block and having a blank-engagingcenter stud, spring means normally urging said center follower fromthedie block, and a shouldered retaining ring on the die blockfor limitingthe movement of said center follower.

2. In die mechanism of the character described, reciprocatively opposeddie blocks, a central stud fixed to one of said blocks having acylindrical body and taper cam, a follower plate reciprocable on suchstud,- spring means tending to thrust said follower plate laway fromsaid block, a shouldered retaining ring for limiting movement of saidfollower plate, iminner set of radially movable die sections on saidfollower plate to be spread'by said taper cam and having raised centralportions with peripheral die surfaces, an outer set of radially movabledie sections on said inner die sections, beveled cam surfaces on theouter ends of said outer die sections, means for separating the outerand inner die sections, a retaining ring for holding said outer diesections against disassembly, an internally beveled cam ring carried bythe other of the first-mentioned opposed die blocks adapted to coaetwith the beveled cam surfaces on the outer ends of said outer diesections, a follower ring carried by the same die block intemally ofsaid cam ring, spring means normally urging said follower ring from thedie block, a center follower carried by the same die block and having ablank-engaging center stud, spring means normally urging said centerfollower from the die block, and a shouldered retaining ring on the dieblock for limiting the movement of said center follower.

3. In die mechanism of the character described, reciprocatively opposeddie blocks, a central stud ilxed to one of said blocks having acylindrical body and taper cam, a follower plate reciprocable on suchstud, spring means tending to thrust said follower plate away fromsaidblock, a shouldered retaining ring for limiting movement of saidfollower plate,an inner set of radially movable die sections on saidfollower plate to bey spread by said taper cam and having raised cen--tral portions with peripheral die surfaces, an outer set of radiallymovable die sections on said inner die sections, means for separatingthe outer and inner die sections, a retaining ring for holding'saidouter die sections' against disassembly, cam means carried by the otherof the firstmentioned opposed die .blocks to operate said outer diesections, a follower ring carried by the same die block internally ofsaid cam ring, spring means normally urging said follower ring from thedie block, a center follower carried by the same die block and having ablank-engaging center stud, spring means normally urging said centerfollower from the die block, and a shouldered retaining ring on the dieblock'for limiting the movement of said center follower.

4. In die mechanism of the character described, reciprocatively opposeddie blocks, a cen; tral stud fixed to one of said blocks having acylindrical body and taper cam, a follower plate reciprocable on suchstud, spring means tending to thrust said follower plate away from saidblock, a shouldered retaining ring for limiting movement of saidfollower plate, an inner set of radially movable die sections on saidfollower plate to be spread by said taper cam and having raised centralportions with peripheral die surfaces, an outer set of radially movabledie sections on` said inner die sections, means for separating the outerand inner die sections, airetaining ring for holding said outer diesections against disassembly, cam means carried by the other of thefirst-mentioned opposed die blocks to operate said outer die sections, afollower ring carried by the same dieblock internally of said cam ring,a center follower carried by the same die block and having ablank-engaging center stud, and a shouldered retaining ring on the dieblock for limiting the movement of said center follower.

5. In die mechanism of the character described, reciprocatively opposeddie blocks, a central stud xed to one of said blocks having acylindrical body' and taper cam, a follower plate reciprocable on suchstud, spring means tending to thrust said follower plate away from saidblock, a shouldered retaining ring for limiting movement of saidfollower plate, an inner set of radially movable die sections on saidfollower plate to be spread by said taper cam and having Lraised centralportions with peripheral die surfaces, an outer set of radially movabledie sections on said 'Cil inner die sections, means for separating theouter v and inner die sections, a retaining'ring for holding said outerdie sections against disassembly, cam means carried by the other of thefirst-mentioned opposed die blocks to operate said outer die sections, afollower ring carried by the same die block internally of said cam ring,a center follower carried by the same die block and having ablank-engaging center stud, and means for limiting the movement of saidcenter follower on the die block.

6. In die mechanism of the character described, reciprocatively opposeddie blocks, av central stud fixed to one of said blocks having acylindrical body and a taper cam, a follower plate reciprocable on saidstud, means for limiting the movement of said follower plate, an innerset of radially movable die sections on said follower plate to be spreadby said taper cam and having central portions withperipheral diesurfaces, an outer set of radially movable die sections on said innerdie sections, means for separating the outer and inner die sections,means for retaining said outer die sections againstdisassembly', cammeans carried by the other of the first-mentioned opposed die blocks tooperate said outer die sections, a follower ring carried by the same dieblock, a center follower also carried by the same die block and having ablank-engaging center stud, and means for limiting the movement of saidcenter follower.

7. -In die mechanism of the character described, reciprocatively opposeddie blocks, a follower plate reciprocable on one of said die blocks,

means for limiting the movement of said follower resiliently-urgedblank-engaging follower carried by the other of the first-mentionedopposed die blocks, a follower ring about said center follower, and cammeans carried by the same die block to operate said outer die sections.

GEORGE 'M AMBROSIUS.

